<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/Welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 添加分类按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格区域 -->
      <tree-table
        class="treetable"
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
      >
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="(scope.row.cat_delete = 'false')"
            style="color: lightgreen"
          ></i>
          <i class="el-icon-error" v-else style="color: red"></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level == 0">一级</el-tag>
          <el-tag
            type="success"
            size="mini"
            v-else-if="scope.row.cat_level == 1"
            >二级</el-tag
          >
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit"
            >编辑</el-button
          >
          <el-button size="mini" type="danger" icon="el-icon-delete"
            >删除</el-button
          >
        </template>
      </tree-table>

      <!-- 分页区 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[2, 5, 10, 20]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%" @close="addCateDialogClose">
      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <!-- options 用来指定数据源 -->
          <!-- props用来指定配置对象 -->
          <el-cascader
            expand-trigger='hover' 
            clearable
            v-model="selectKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChange"
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate"
          >确 定</el-button 
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //查询条件保存
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //商品分类的数据列表
      cateList: [],
      total: 0,
      //为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          type: "template",
          template: "isok",
        },
        {
          label: "排序",
          type: "template",
          template: "order",
        },
        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ],
      // 添加分类对话框显示与隐藏
      addCateDialogVisible: false,
      // 添加分类的表单数据对象
      addCateForm: {
        //将要添加的分类名称
        cat_name: "",
        //父级分类id
        cat_id: 0,
        //分类的等级，默认要添加的是1级分类
        cat_level: 0,
      },
      //添加分类表单验证规则对象
      addCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
        ],
      },
      //父级分类的列表
      parentCateList: [],
      //指定级联选择器的配置对象
      cascaderProps:{
        value:'cat_id',
        label:'cat_name',
        children:'children',
      },
      //选中的父级分类ID数组
      selectKeys:[]
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.querInfo,
      });
      if (res.meta.status !== 200) {
        this.$message.error("用户列表获取失败");
      }
      // console.log(res.data)
      //赋值给cateList
      this.cateList = res.data.result;
      this.total = res.data.total;
    },
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize;
      this.getCateList();
    },
    handleCurrentChange(newPuge) {
      this.querInfo.pagenum = newPuge;
      this.getCateList();
    },
    //点击按钮，展示添加分类对话框
    showAddCateDialog() {
      //先获取父级分类的数据列表
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },
    //获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: {
          type: 2,
        },
      });
      if (res.meta.status !== 200) {
        return this.$message.error("父级分类获取失败");
      }
      this.parentCateList = res.data;
      console.log(this.parentCateList)
    },
    //选择项发生变化出发这个函数
    parentCateChange(){
      //如果selectKeys数组中的length大于0 证明选中了父级分类
      //反之，就说明没有选中父级分类
      if(this.selectKeys.length>0){
        //父级分类的Id
       this.addCateForm.cat_pid = this.selectKeys[this.selectKeys.length-1]
       //当前分类的等级赋值
       this.addCateForm.cat_level = this.selectKeys.length
       return
      }else{
        this.addCateForm.cat_pid = 0
       //当前分类的等级赋值
       this.addCateForm.cat_level = 0
      }
    },
    //添加分类确定事件
     addCate(){
      this.$refs.addCateFormRef.validate(async valid =>{
        if(!valid) return
        const {data:res} = await this.$http.post('categories',this.addCateForm)
        if(res.meta.status !==201 ) return this.$message.error('分类添加失败')
        this.$message.success('添加成功')
        this.getCateList();
        this.addCateDialogVisible=false;
      })
    },
    //监听对话框的关闭事件，清空选项框
    addCateDialogClose(){
      this.$refs.addCateFormRef.resetFields();
      this.selectKeys = [];
      this.addCateForm.cat_pid =0;
      this.addCateForm.cat_level=0;
    }
  },
};
</script>

<style scoped>
.treetable {
  margin-top: 15px;
}
</style>